slate blue

Has anybody got any flow figures from their manifolds, S4 or GT ones? They certainly need some porting around the mating surface.

IcemanG17

Calling Marc Thomas.....he would know!!! It does flow enough to get 500rwhp out of the 6.5L white car? So it must be pretty good

John Speake

Hi Greg,
There was some info in the Paul Threshie article in Sept 2002 "928 Forum" magazine.

Regards

Jim bailey - 928 International

The GT heads did get a small amount of "port matching" by hand to eliminate the somewhat obvious variances between runners and ports. Some are using spacer plates to move the sideplates out farther or Tom Cloutier has fabricated twin throttle bodies one mounted to each side plate.